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Microstructure of Mixed Cadmium Stearate and Behenate Langmuir-Blodgett Films
Jing-xue Wang*1,2, Chao Zhang1, Zheng-xin Zhang1, Qing-dong Chen1, Qing-guo Zhang1, Zu-liang Du2
1.Science School of Henan University of Science and Technology, Luoyang 471003, China;2.Key Laboratory for Special Functional Materials, Henan University, Kaifeng 475001, China
Abstract:
X-ray diffraction (XRD) was used to investigate the microstructure and phase separation of mixed multilayers of cadmium stearate (SA) and behenate (BA) deposited onto hydrophilic glass by the Langmuir-Blodgett technique. No unitary fatty acid diffraction peaks in the XRD spectra of the mixed LB films, which reveals that domains in these samples are small and uniform. The interplanar spacing of the mixed LB films changes with the ratio of BA to SA in a step-shaped curve, which suggests that with the changing of the ratio between BA and SA, only three kinds of ordered structure form in the mixed system, and each microstructure, in particular, the short chains against long chains meshed microstructure can be maintained in a certain ratio range . In addition, for the meshed microstructure, the alkyl chains of both SA and BA stand straight or may have exactly the same small tilted angle from the substrate normal, as is indicated by the symmetric and asymmetric stretching vibration of methylene (CH2) peaks which are at 2847.80 and 2914.37 cm-1respectively in the Fourier transform infrared (FT-IR) transmission spectra. The mixed system always goes through a longitudinal regularity decreasing process when BA/SA is out of the intermediate ratio range (BA/SA: 1/5-1/1), which is illustrated by the relative XRD intensity changing with the ratio of BA/ SA in a \W" shape. These results for the mixed LB films of BA/SA provide meaningful data for choosing the mixture ratio when fabricating composite films with special structure.
Key words:  Langmuir-Blodgett (LB) ˉlm, Microstructure, X-ray di?raction (XRD), FT-IR transmission spectrum
FundProject:
硬脂酸镉和山嵛酸镉混合LB膜的微结构
王景雪* 1,2, 张超 1, 汤正新 1, 陈庆东 1, 张庆国 1, 杜祖亮 2
1.河南科技大学理学院,洛阳471003;2.河南大学特种功能材料重点实验室,开封475001
摘要:
用X射线衍射研究了沉积于亲水玻璃基底上的硬脂酸镉和山嵛酸镉多层混合LB膜的微区结构和相分离情况.纯的脂肪酸镉衍射峰没有在混合LB膜的XRD谱图中出现,说明混合膜中形成的微区很小而且均匀分布.混合膜样品的面间距随硬脂酸镉和山嵛酸镉混合比例的变化形成一条台阶状的曲线,这表明在它们比例变化的过程中,只形成了三种有序的结构,而且每一种结构,特别是长短链交错的微结构,可以在一定的比例范围内保持;另外,在长短链交错的微结构中,两种脂肪酸长链具有相同的偏离膜平面法线方向的小倾角,这也可由它们傅立叶红外透射谱中表征脂肪酸长链分子取向的亚甲基CH2相同的峰位2847.80和2914.37 cm-1(对应于CH2对称和反对称伸缩振动)得到说明.当混合比例超出1/5?1/1,混合膜将会经历一个纵向有序度降低的过程,表现为混合膜相对X射线衍射强度随混合比例以\W"形变化.
关键词:  LB膜,微结构,X射线衍射,傅立叶红外透射谱
DOI:10.1360/cjcp2007.20(2).191.6
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